[Snippets] Add error handling to rewrite-site-links.mdx

[pedrosousa]

Summary

Closes #23067.

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PR Change Summary

Enhanced error handling in the rewrite-site-links documentation to ensure proper response validation.

• Added checks for the presence of 'Content-Type' header in the response
• Implemented validation for the 'Content-Type' header to ensure it is a string
• Ensured that non-HTML responses are passed through without transformation

Modified Files

• src/content/docs/rules/snippets/examples/rewrite-site-links.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/rules/	@pedrosousa, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://c9ae0b6c.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-issue23067-snippets-error-handling.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/rules/snippets/examples/rewrite-site-links/	https://pedro-issue23067-snippets-error-handling.preview.developers.cloudflare.com/rules/snippets/examples/rewrite-site-links/